Machine for making printing plates



Nov. 1, 1932. H. HAMADA 1,886,182

MACHINEFOR MAKING PRINTING FLATES Filed Jan. 19, 1951 2 Sheets-Sheet l Fiyi1 12 I N VEN TOR.

*6 Wanna/Q ATTORNEY.

Nov. 1, 1932. H. HAMADA 1,886,182

MACHINE FOR MAKING PRINTING PLATES Filed Jan. 19,- 1951 2 Sheets-Sheet, 2

A I b I I 23 i--- .1. 25

INVENTOR.

A TTORNE Y.

Patented Nov. 1, 1232 UNITED stares earsrsr series HATSUJ'IRO HAMADA, OF TOKYOTU, JAPAN MACHINE FOR MAKING rRinrrne'rLA'rns Application filed January 19, 1931'." Serial No. 509,76'Tf.

This invention relates to a machine for making printing plates adapted to produce a number of a design re ularly arranged one after another on a blank printing plate from 5 an original by means of offset printing and has for its object to provide a machine for making a printing plate whereby a number of designs regularly arranged one after another may-easily be producedon a blank printing 1 plate from an original, so that the efficiency is improved and the cost is considerably lowered. I

In the accompanying drawings:

Fig. 1 is a plan view of the machine, part- 15 ly broken away and in section to show inner broken away and in section on line TIL-III to show inner view. 7

' Fig. at is a cross section on line IV IV of Fig. 3 viewed in the direction of the arrow line, and partly detached.

Referring to the drawings, 1 is a cylinder for holding a blank printing plate 2 to be worked and is mounted on a shaft 3, in such a manner that it can be rotated with said shaft, whilst it may be independently rotated on said shaft so as to change the relative an gular position thereto, the shaft being rotatably mounted on machine frames 4,4. For this purpose, a circular disc 5 is secured on the shaft 3, which is provided with brackets 5 adapted to support a worm 6 engaging with a ring-shaped worm wheel 7. The worm wheel carries on its inner side bevel gears 8 engaging with bevel gears 9 and 10 respectively fixed on a boss of the cylinder 1 and on the disc 5, as more clearly shown in Figs. 3 and 4. With such an arrangement,

it will be noted that, when the shaft 3 rotates,

the cylinder 1 will rotate with it, and that the cylinder may be independently rotated on said shaft by rotating the worm 6, said bevel gears forming a differential gear device.

The printing plate 2 is tightly stretched on and detachably secured thereto by known or the circumferential surface of the cylinder 1 any suitable means which is locatedin a longitudinal depression 1 formed on the cylinder to extend through its length.

11 is an approximate quadrant cylinder of the same diameter as that of the cylinder 1 for holding an india-rubber blanket 12 on its circumferential surface by suitable means and is splined to a shaft 18 so that thesame may have a transverse as well as a rotary movement, the shaft being rotatably mounted on, bracl s 1 1-1 of a carriage 14 transversely movable on a slide bed 15 secured to the frames 1, in such a position that said blanket to a rolling contact with the print-.

will come .ing plate 2 on the cylinder 1 as they rotate.

A worm wheel 16 is splined to the shaft 13 to permit a transverse as well as a rotary movement and engages with a Worm 17 rotatably mounted on extensions 14?, 14 of one bracket 1 1 and havingan operating hand wheel 18. The worm wheel 16 is linked to said bracket by suitable means as indicated by 16 so as to be kept always in an operative engagement with the worm 17. V

lVhen the hand wheel 18 is rotated, the shaft 13 will rotate and consequently the shaft 3 will be rotated throughmeans of a gear wheel 19 fixed thereon and another gear wheel 20 fixed on the shaft 13 to mesh with said gear wheel 19, thereby the quadrant cyl-' inder 11 with a blanket 12 is moved for rolling contact withthe cylinder 1. The carriage 1 imay'be transversely moved on the slide bed 15 by means of a screw shaft 21 rotatably mounted on the frames rand engaging with threaded under pro ections 1 1 and having as said quadrant cylinder revolves, as more:

clearly shown in Fig; 2. V The slide bed 25 is mounted on supports. 27 27 secured to the frames 4, soas to permit an endwise movement with a guide 25 on guide ways 27 on said supports, and is held in its forward inoperative position by means of sector gears 28 engaging with racks 25 provided on the under side of said slide bed and connected, on a shaft 29 secured to said supports by means of springs 30, so that said slide bed may be moved rearwardly against the action of said springs and on release returned to the original forward position by means of the springs.

Sector gears 26, 26 are fixed on the shaft 13 near its ends, each of which is adapted to engage with racks 25 adjacent the ends-of the slide bed 25 each section carrying a projection '26 adapted to engage. corresponding projections 25 provided at the inner sides of the racks 25 prior to the engagement of said sector gears with said racks to ensure a correct meshing of teeth of said sector gears with teeth of said racks, when said sector gears rotate.

On the rotation of the shaft 13, the sector gear 26 will be rotated in a forward direction, and the slide bed 25 and hence the holder 23 carrying the original 24 will be moved rearwardly when said sector gears engage with the racks 25, whereby the blanketv 12 is caused to contact with the original. If the original has beeninked, the blanket will re-.

ceive the imprint of the design thereon upon contact of said blanket with the original. On

further rotation, the sector gears 26 will disengage the racks 25 after the quadrant cylinder 11 has passed from contact with the original 24, and then the slide bed and hence the original will be returned to its forward position by action of the springs 30. On further rotation of the quadrant cylinder, the

blanket will have a rolling contact with the printing plate 2 on the cylinder 1, said cylinder being rotated by the shaft 13 through means of the gear wheels 19 and 20, so that a design printed on the blanket will be reproduced on said printing plate.

As the cooperative position of the quadrant cylinder 11 and the cylinder 1 may be adjusted by means of the hand wheels 22 on the screw shaft 21 and the worm 6 engaging with the worm wheel 7 as above described, it will be seen that a number of a design regularly arranged one after another can be easily printed on a printing plate from an original by the ofiiset printing.

Graduated circular discs 31, and 32 are fixed on the shaft 3 for the cylinder 1 and the shaft 13 for the quadrant cylinder 11 respectively. Index 33 is fixed on the boss of the cylinder 1 and index 34 is adj ustably secured to the shaft 13 by suitable means, such as a.

set screw 35. These disc graduated circular discs and indexes serve to indicate the relative position of the cylinder 1 with the quadrant cylinder 11.

Having now particularly described and as:

certained the nature of my said invention and in what manner the same is to be performed I claim:

1. A machine for making printing plates comprising a blanket cylinder, a shaft for the blanket cylinder having sector gears fixed thereto an endwise movable slide bed having racks thereon and carrying the holder for the original, projections on the sector gears and on the bed, the projections of the sector gears being adapted to engage the projections on the bed prior, to engagement of the sector gears with the racks for ensuring correct engagement of the teeth of the gears and racks.

, 2. Amachine for making printingplates comprising a blanket cylinder, a shaft for the blanket cylinder, sector gears on the shaft, an endwise movable slide bed having racks upon its upper side, the holder for the ori ginal bein carried by said bed, said bed having racks on its under side, a shaft having sector gears thereon meshing with the latter racks, springs associated with the latter shaft to actuate the lat-ter sector gears -to return the holder to its forward position for disengagement of the sectors of the shaft of the blanket cylinder with the racks on the upper side of the slide bed, as and for the purpose set forth.

3. A machine of the class described comprising a printing plate cylinder, a shaft supporting said cylinder, a blanket cylinder, a shaft supporting the blanket cylinder, each shaft having fixed thereon a graduated circular disk, an index connected with the printsha of the blanket cylinder and cooperating with said disks.

In testimony whereof I afiix my signature.

HATSUJIRO HAMADA.

ingfplate cylinder, and an index fixed to the.

Flt 

